fix(oiiotool): Ignore empty subimage(s) when calculating non-zero region#4909

lgritz merged 1 commit intoAcademySoftwareFoundation:mainAcademySoftwareFoundation/OpenImageIO:mainfrom

RaynaultVFX:fix_trim_empty_subimageRaynaultVFX/OpenImageIO:fix_trim_empty_subimageCopy head branch name to clipboard